{\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}          \begin{tabular}              {@{\extracolsep{4pt}}l*{10}{>{\centering\arraybackslash}m{3.5cm}}@{}}      \toprule           &\multicolumn{1}{c}{Hours of sleep}  &\multicolumn{1}{c}{Sleep quality scale}  &\multicolumn{1}{c}{Had a good sleep}  \\         
                    &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         \\
\midrule
Cash                &      -0.062         &      -0.056         &      -0.047         \\
                    &     (0.164)         &     (0.061)         &     (0.043)         \\
\midrule
Control group mean  &        6.90         &        2.76         &        0.82         \\
N: workers          &         400         &         400         &         400         \\
\bottomrule
\end{tabular}
}
